class MediaLibraryTestBase

abstract class MediaLibraryTestBase extends WebDriverTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'media_library_test',
        'hold_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * Create media items.
     *
     * @param array $media_items
     *   A nested array of media item names keyed by media type.
     *
     * @return \Drupal\media\MediaInterface[]
     *   An array of media entities keyed by the names passed in.
     */
    protected function createMediaItems(array $media_items) {
        $created_items = [];
        $time = time();
        foreach ($media_items as $type => $names) {
            foreach ($names as $name) {
                
                /** @var \Drupal\media\MediaInterface $media */
                $media = Media::create([
                    'name' => $name,
                    'bundle' => $type,
                ]);
                $source_field = $media->getSource()
                    ->getSourceFieldDefinition($media->bundle->entity)
                    ->getName();
                $media->set($source_field, $name)
                    ->setCreatedTime(++$time)
                    ->save();
                $created_items[$name] = $media;
            }
        }
        return $created_items;
    }
    
    /**
     * Asserts that text appears on page after a wait.
     *
     * @param string $text
     *   The text that should appear on the page.
     * @param int $timeout
     *   Timeout in milliseconds, defaults to 10000.
     *
     * @todo replace with whatever gets added in
     *   https://www.drupal.org/node/3061852
     */
    protected function waitForText($text, $timeout = 10000) {
        $result = $this->assertSession()
            ->waitForText($text, $timeout);
        $this->assertNotEmpty($result, "\"{$text}\" not found");
    }
    
    /**
     * Asserts that text does not appear on page after a wait.
     *
     * @param string $text
     *   The text that should not be on the page.
     * @param int $timeout
     *   Timeout in milliseconds, defaults to 10000.
     *
     * @todo replace with whatever gets added in
     *   https://www.drupal.org/node/3061852
     */
    protected function waitForNoText($text, $timeout = 10000) {
        $page = $this->getSession()
            ->getPage();
        $result = $page->waitFor($timeout / 1000, function ($page) use ($text) {
            $actual = preg_replace('/\\s+/u', ' ', $page->getText());
            $regex = '/' . preg_quote($text, '/') . '/ui';
            return (bool) (!preg_match($regex, $actual));
        });
        $this->assertNotEmpty($result, "\"{$text}\" was found but shouldn't be there.");
    }
    
    /**
     * Checks for a specified number of specific elements on page after wait.
     *
     * @param string $selector_type
     *   Element selector type (css, xpath)
     * @param string|array $selector
     *   Element selector.
     * @param int $count
     *   Expected count.
     * @param int $timeout
     *   Timeout in milliseconds, defaults to 10000.
     *
     * @todo replace with whatever gets added in
     *   https://www.drupal.org/node/3061852
     */
    protected function waitForElementsCount($selector_type, $selector, $count, $timeout = 10000) {
        $page = $this->getSession()
            ->getPage();
        $start = microtime(TRUE);
        $end = $start + $timeout / 1000;
        do {
            $nodes = $page->findAll($selector_type, $selector);
            if (count($nodes) === $count) {
                return;
            }
            usleep(100000);
        } while (microtime(TRUE) < $end);
        $this->assertSession()
            ->elementsCount($selector_type, $selector, $count);
    }
    
    /**
     * Asserts that text appears in an element after a wait.
     *
     * @param string $selector
     *   The CSS selector of the element to check.
     * @param string $text
     *   The text that should appear in the element.
     * @param int $timeout
     *   Timeout in milliseconds, defaults to 10000.
     *
     * @todo replace with whatever gets added in
     *   https://www.drupal.org/node/3061852
     */
    protected function waitForElementTextContains($selector, $text, $timeout = 10000) {
        $element = $this->assertSession()
            ->waitForElement('css', "{$selector}:contains('{$text}')", $timeout);
        $this->assertNotEmpty($element);
    }
    
    /**
     * Waits for the specified selector and returns it if not empty.
     *
     * @param string $selector
     *   The selector engine name. See ElementInterface::findAll() for the
     *   supported selectors.
     * @param string|array $locator
     *   The selector locator.
     * @param int $timeout
     *   Timeout in milliseconds, defaults to 10000.
     *
     * @return \Behat\Mink\Element\NodeElement
     *   The page element node if found. If not found, the test fails.
     *
     * @todo replace with whatever gets added in
     *   https://www.drupal.org/node/3061852
     */
    protected function assertElementExistsAfterWait($selector, $locator, $timeout = 10000) {
        $element = $this->assertSession()
            ->waitForElement($selector, $locator, $timeout);
        $this->assertNotEmpty($element);
        return $element;
    }
    
    /**
     * Gets the menu of available media types.
     *
     * @return \Behat\Mink\Element\NodeElement
     *   The menu of available media types.
     */
    protected function getTypesMenu() {
        return $this->assertSession()
            ->elementExists('css', '.js-media-library-menu');
    }
    
    /**
     * Clicks a media type tab and waits for it to appear.
     */
    protected function switchToMediaType($type) {
        $link = $this->assertSession()
            ->elementExists('named', [
            'link',
            "Type {$type}",
        ], $this->getTypesMenu());
        if ($link->hasClass('active')) {
            // There is nothing to do as the type is already active.
            return;
        }
        $link->click();
        $result = $link->waitFor(10, function ($link) {
            
            /** @var \Behat\Mink\Element\NodeElement $link */
            return $link->hasClass('active');
        });
        $this->assertNotEmpty($result);
        // assertWaitOnAjaxRequest() required for input "id" attributes to
        // consistently match their label's "for" attribute.
        $this->assertSession()
            ->assertWaitOnAjaxRequest();
    }
    
    /**
     * Checks for the existence of a field on page after wait.
     *
     * @param string $field
     *   The field to find.
     * @param int $timeout
     *   Timeout in milliseconds, defaults to 10000.
     *
     * @return \Behat\Mink\Element\NodeElement|null
     *   The element if found, otherwise null.
     *
     * @todo replace with whatever gets added in
     *   https://www.drupal.org/node/3061852
     */
    protected function waitForFieldExists($field, $timeout = 10000) {
        $assert_session = $this->assertSession();
        $assert_session->waitForField($field, $timeout);
        return $assert_session->fieldExists($field);
    }
    
    /**
     * Waits for a file field to exist before uploading.
     */
    public function addMediaFileToField($locator, $path) {
        $page = $this->getSession()
            ->getPage();
        $this->waitForFieldExists($locator);
        $page->attachFileToField($locator, $path);
    }
    
    /**
     * Clicks "Save and select||insert" button and waits for AJAX completion.
     *
     * @param string $operation
     *   The final word of the button to be clicked.
     */
    protected function saveAnd($operation) {
        $this->assertElementExistsAfterWait('css', '.ui-dialog-buttonpane')
            ->pressButton("Save and {$operation}");
        // assertWaitOnAjaxRequest() required for input "id" attributes to
        // consistently match their label's "for" attribute.
        $this->assertSession()
            ->assertWaitOnAjaxRequest();
    }
    
    /**
     * Clicks "Save" button and waits for AJAX completion.
     *
     * @param bool $expect_errors
     *   Whether validation errors are expected after the "Save" button is
     *   pressed. Defaults to FALSE.
     */
    protected function pressSaveButton($expect_errors = FALSE) {
        $buttons = $this->assertElementExistsAfterWait('css', '.ui-dialog-buttonpane');
        $buttons->pressButton('Save');
        // If no validation errors are expected, wait for the "Insert selected"
        // button to return.
        if (!$expect_errors) {
            $result = $buttons->waitFor(10, function ($buttons) {
                
                /** @var \Behat\Mink\Element\NodeElement $buttons */
                return $buttons->findButton('Insert selected');
            });
            $this->assertNotEmpty($result);
        }
        // assertWaitOnAjaxRequest() required for input "id" attributes to
        // consistently match their label's "for" attribute.
        $this->assertSession()
            ->assertWaitOnAjaxRequest();
    }
    
    /**
     * Clicks a button that opens a media widget and confirms it is open.
     *
     * @param string $field_name
     *   The machine name of the field for which to open the media library.
     * @param string $after_open_selector
     *   The selector to look for after the button is clicked.
     *
     * @return \Behat\Mink\Element\NodeElement
     *   The NodeElement found via $after_open_selector.
     */
    protected function openMediaLibraryForField($field_name, $after_open_selector = '.js-media-library-menu') {
        $this->assertElementExistsAfterWait('css', "#{$field_name}-media-library-wrapper.js-media-library-widget")
            ->pressButton('Add media');
        $this->waitForText('Add or select media');
        // Assert that the grid display is visible and the links to toggle between
        // the grid and table displays are present.
        $this->assertMediaLibraryGrid();
        $assert_session = $this->assertSession();
        $assert_session->linkExists('Grid');
        $assert_session->linkExists('Table');
        // The "select all" checkbox should never be present in the modal.
        $assert_session->elementNotExists('css', '.media-library-select-all');
        return $this->assertElementExistsAfterWait('css', $after_open_selector);
    }
    
    /**
     * Gets the "Additional selected media" area after adding new media.
     *
     * @param bool $open
     *   Whether or not to open the area before returning it. Defaults to TRUE.
     *
     * @return \Behat\Mink\Element\NodeElement
     *   The "additional selected media" area.
     */
    protected function getSelectionArea($open = TRUE) {
        $summary = $this->assertElementExistsAfterWait('css', 'summary:contains("Additional selected media")');
        if ($open) {
            $summary->click();
        }
        return $summary->getParent();
    }
    
    /**
     * Asserts a media item was added, but not yet saved.
     *
     * @param int $index
     *   (optional) The index of the media item, if multiple items can be added at
     *   once. Defaults to 0.
     */
    protected function assertMediaAdded($index = 0) {
        $selector = '.js-media-library-add-form-added-media';
        // Assert that focus is shifted to the new media items.
        $this->assertJsCondition('jQuery("' . $selector . '").is(":focus")');
        $assert_session = $this->assertSession();
        $assert_session->pageTextMatches('/The media items? ha(s|ve) been created but ha(s|ve) not yet been saved. Fill in any required fields and save to add (it|them) to the media library./');
        $assert_session->elementAttributeContains('css', $selector, 'aria-label', 'Added media items');
        $fields = $this->assertElementExistsAfterWait('css', '[data-drupal-selector="edit-media-' . $index . '-fields"]');
        $assert_session->elementNotExists('css', '.js-media-library-menu');
        // Assert extraneous components were removed in
        // FileUploadForm::hideExtraSourceFieldComponents().
        $assert_session->elementNotExists('css', '[data-drupal-selector$="preview"]', $fields);
        $assert_session->buttonNotExists('Remove', $fields);
        $assert_session->elementNotExists('css', '[data-drupal-selector$="filename"]', $fields);
    }
    
    /**
     * Asserts that media was not added, i.e. due to a validation error.
     */
    protected function assertNoMediaAdded() {
        // Assert the focus is shifted to the first tabbable element of the add
        // form, which should be the source field.
        $this->assertJsCondition('jQuery(tabbable.tabbable(document.getElementById("media-library-add-form-wrapper"))[0]).is(":focus")');
        $this->assertSession()
            ->elementNotExists('css', '[data-drupal-selector="edit-media-0-fields"]');
        $this->getTypesMenu();
    }
    
    /**
     * Presses the modal's "Insert selected" button.
     *
     * @param string $expected_announcement
     *   (optional) The expected screen reader announcement once the modal is
     *   closed.
     *
     * @todo Consider requiring screen reader assertion every time "Insert
     *   selected" is pressed in
     *   https://www.drupal.org/project/drupal/issues/3087227.
     */
    protected function pressInsertSelected($expected_announcement = NULL) {
        $this->assertSession()
            ->elementExists('css', '.ui-dialog-buttonpane')
            ->pressButton('Insert selected');
        $this->waitForNoText('Add or select media');
        if ($expected_announcement) {
            $this->waitForText($expected_announcement);
        }
    }
    
    /**
     * Gets all available media item checkboxes.
     *
     * @return \Behat\Mink\Element\NodeElement[]
     *   The available checkboxes.
     */
    protected function getCheckboxes() {
        return $this->getSession()
            ->getPage()
            ->findAll('css', '.js-media-library-view .js-click-to-select-checkbox input');
    }
    
    /**
     * Selects an item in the media library modal.
     *
     * @param int $index
     *   The zero-based index of the item to select.
     * @param string $expected_selected_count
     *   (optional) The expected text of the selection counter.
     */
    protected function selectMediaItem($index, $expected_selected_count = NULL) {
        $checkboxes = $this->getCheckboxes();
        $this->assertGreaterThan($index, count($checkboxes));
        $checkboxes[$index]->check();
        if ($expected_selected_count) {
            $this->assertSelectedMediaCount($expected_selected_count);
        }
    }
    
    /**
     * Switches to the grid display of the widget view.
     */
    protected function switchToMediaLibraryGrid() {
        $this->getSession()
            ->getPage()
            ->clickLink('Grid');
        // Assert the display change is correctly announced for screen readers.
        $this->waitForText('Loading grid view.');
        $this->waitForText('Changed to grid view.');
        $this->assertMediaLibraryGrid();
    }
    
    /**
     * Switches to the table display of the widget view.
     */
    protected function switchToMediaLibraryTable() {
        hold_test_response(TRUE);
        $this->getSession()
            ->getPage()
            ->clickLink('Table');
        // Assert the display change is correctly announced for screen readers.
        $this->waitForText('Loading table view.');
        hold_test_response(FALSE);
        $this->waitForText('Changed to table view.');
        $this->assertMediaLibraryTable();
    }
    
    /**
     * Asserts that the grid display of the widget view is visible.
     */
    protected function assertMediaLibraryGrid() {
        $this->assertSession()
            ->elementExists('css', '.js-media-library-view[data-view-display-id="widget"]');
    }
    
    /**
     * Asserts that the table display of the widget view is visible.
     */
    protected function assertMediaLibraryTable() {
        $this->assertSession()
            ->elementExists('css', '.js-media-library-view[data-view-display-id="widget_table"]');
    }
    
    /**
     * Asserts the current text of the selected item counter.
     *
     * @param string $text
     *   The expected text of the counter.
     */
    protected function assertSelectedMediaCount($text) {
        $selected_count = $this->assertSession()
            ->elementExists('css', '.js-media-library-selected-count');
        $this->assertSame('status', $selected_count->getAttribute('role'));
        $this->assertSame('polite', $selected_count->getAttribute('aria-live'));
        $this->assertSame('true', $selected_count->getAttribute('aria-atomic'));
        $this->assertSame($text, $selected_count->getText());
    }

}